we do not share your data with anyone and there are many ways to control the visibility and storage life of your data here.
but the internet is a public space and you should always assume your data could be compromised.
be smart with your password, use tor or a vpn, and use pgp for sensitive communications.
I'm in South America and the city beaches are rated too dirty to swim in by local authorities. Despite this I see many local people swimming in the ocean every day. They tell me they have built-up immunities and don't get sick like I would.
My question is do I go for building up these immunities myself? I will be here yearly for a few months for work.